WO2000044788A1 - Production of tetravalent antibodies - Google Patents
Production of tetravalent antibodies Download PDFInfo
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- WO2000044788A1 WO2000044788A1 PCT/US2000/001893 US0001893W WO0044788A1 WO 2000044788 A1 WO2000044788 A1 WO 2000044788A1 US 0001893 W US0001893 W US 0001893W WO 0044788 A1 WO0044788 A1 WO 0044788A1
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- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
- C07K16/2887—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against CD20
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
- A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
- A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
- A61K47/6835—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site
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- A61P35/00—Antineoplastic agents
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- A61P35/02—Antineoplastic agents specific for leukemia
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- A61P37/00—Drugs for immunological or allergic disorders
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- A—HUMAN NECESSITIES
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- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P37/00—Drugs for immunological or allergic disorders
- A61P37/02—Immunomodulators
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P37/00—Drugs for immunological or allergic disorders
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
- C07K16/2851—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the lectin superfamily, e.g. CD23, CD72
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/46—Hybrid immunoglobulins
- C07K16/468—Immunoglobulins having two or more different antigen binding sites, e.g. multifunctional antibodies
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K39/00—Medicinal preparations containing antigens or antibodies
- A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/30—Immunoglobulins specific features characterized by aspects of specificity or valency
- C07K2317/31—Immunoglobulins specific features characterized by aspects of specificity or valency multispecific
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/70—Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
- C07K2317/73—Inducing cell death, e.g. apoptosis, necrosis or inhibition of cell proliferation
- C07K2317/734—Complement-dependent cytotoxicity [CDC]
Definitions
- the present invention generally relates to a novel process for the preparation of biologically active antibody dimers and a pharmaceutically acceptable compositions containing such dimers.
- These dimers can be composed of two antibody molecules having the same antigen binding specificity and linked through a reducible, disulfide, or a non-reducible thioether, bond (homodimers) or, alternatively, can be composed of two different antibody molecules having binding specificity for two distinct antigens (heterodimers).
- the subject antibody dimers are useful for inducing hyper-cross-linking of membrane antigens.
- the present invention further relates to the use of biologically active antibody dimers for the preferential killing or inhibition of selected cell populations in the treatment of diseases such as cancer and autoimmune disorders.
- Monoclonal antibodies were once thought to be an ideal way to target malignant tissues, by delivering a killing agent, while leaving healthy tissue intact. However, their clinical potential is limited due to the need to covalently couple the killing agent to the monoclonal antibody. Thus, in an effort to alleviate such limitations, bispecific antibodies were developed, which remain bivalent, but are specific for a target cell on one arm of the antibody and a killing agent on the other arm.
- the killing agent can be a toxin, a drug, a chelated radioisotope, or, more likely, a cytotoxic effector cell.
- Monoclonal antibodies can also show therapeutic activity against specific cells, e.g., malignant tissues based on the interaction of the Fc portion of the antibody heavy chain with other components of the immune system, such as the complement cascade or by binding to Fc ⁇ receptors or various cytotoxic effector cell types.
- Another means of effecting cell death comprises inducing the cross-linking of membrane antigens.
- antibody cross-linking of membrane B-cell markers e.g., surface IgM, Valentine et al., Eur. J. Immunol 22:3141 (1992); and MHC class II, Newell et al., PNAS 90:10459 (1993)
- apoptosis e.g., programmed cell death
- the two antibodies When purified from unreacted linkers and mixed together, the two antibodies complex by formation of a thioether (non-reducible) bridge that links the two IgG molecules, and forming a 300 kDa, tetravalent antibody (C 2 H 2 ) 2g molecule.
- a thioether (non-reducible) bridge that links the two IgG molecules, and forming a 300 kDa, tetravalent antibody (C 2 H 2 ) 2g molecule.
- the yields of the 300 kDa IgG-homodimer were very low (20-25%) and were similar or lower than "spontaneously" formed CD 19 homodimer, which ranged from 20-30% (Ghetie et al., PNAS 9 :7509-7514 (1997)).
- CD20 is a non-glycosylated 35 kDa B-cell membrane protein associated with intracellular signaling, B-cell differentiation and calcium channel mobilization (Clark et al., Adv.
- the antigen appears as an early marker of the human B-cell lineage, and is ubiquitously expressed at various antigen densities on both normal and malignant B cells. However, the antigen is absent on stem cells or pre B cell populations, as well as on the fully matured plasma cell, making it a good target for antibody mediated therapy.
- CD23 is the low affinity receptor for IgE. Antibodies to CD23 have been suggested to be useful for treating allergic and inflammatory responses. In fact, IDEC Pharmaceuticals, Inc., the assignee of this application, has an application pending relating to the use of an anti-CD23 antibody of the IgGl isotype for therapeutic usage.
- CD23 is expressed on B-cells, and particularly by B-cell lymphoma cells. While only a small fraction of the CD20 antigen is expressed on the surface membrane, MAb's binding to the extracellular domain have had variable activities in promoting or inhibiting B cell function.
- the anti-CD20 MAb, 1F5 was originally shown to activate resting (G 0 ) B-cells into (G,/S/G 2 ) proliferating populations (Clark et al, PNAS, USA, 52:1766-70 (1985)). Additionally, Holder et al. (Eur. J. Immunol.
- CD20 MAb's (e.g., 1F5, Bl, B20 and 2H7) had no effect on growth inhibition of proliferating human (CD20+) lymphoma cell lines in vitro, but in vivo showed tumor growth inhibition using human lymphoma mouse xenograft models (Press et al, -5/oo ⁇ 59:584-591 (1987); Shan et a ⁇ ., Blood 91: 1644- 1653 (1998); Funakoshi et al, J. Immunol. 79:93-101 (1996); Hooijberg et al. Cancer Res. 55:840-846 (1995); and Ghetie et al, PNAS 94:7509-7514 (1997)).
- human lymphoma mouse xenograft models Press et al, -5/oo ⁇ 59:584-591 (1987); Shan et a ⁇ ., Blood 91: 1644- 1653 (1998); Funakoshi et al, J.
- CDC complement dependent cell killing
- ADCC antibody dependent cell killing
- C2B8 The chimeric MAb used in the present invention (C2B8) was developed at IDEC Pharmaceuticals Corporation for treatment of human B cell lymphoma (Reff et al. Blood 53:4350445 (1994)).
- C2B8 originated from the murine antibody 2B8 and was cloned and expressed as a 150 kDa IgG monomer in Chinese Hamster Ovary cells.
- MAb C2B8 maintains the 2B8 murine variable region coupled to the human gamma 1 heavy chain and human K light chain constant regions.
- C2B8 was not growth inhibitory and does not induce apoptosis of human lymphoma cell lines in vitro, but does demonstrate anti -tumor activity when tested in vivo using murine xenograft animal models.
- Chimeric C2B8 efficiently binds human complement, has strong FcR binding, and can efficiently kill human lymphocytes in vitro via both complement dependent (CDC) and antibody dependent (ADCC) mechanisms (Reff et al. Blood 83 :435-445 (1994)).
- C2B8 was also strongly depleting of B cells in human Phase I/II clinical trials, but was nevertheless shown to be safe and effective with most side effects infusion related (Maloney et al. Blood 54:2457-2466 (1994) and Maloney et al, JCO 15(10):3266 (1997)).
- the antibody showed an overall response rate of 48% in patients with low grade or follicular lymphoma (McLaughlin et al, JCO, in press). However, the response rate decreased dramatically (34%) in chemo-resistant patients who failed to respond to their last chemotherapy regime (McLaughlin et al, Proc. Am. Soc. Clin. Oncol. 16: 16a. (Abstr. 55) (1997)). Additionally, the antibody showed poor activity in patients with type A histology or with chronic lymphocytic leukemia (CLL). Therefore, the need to increase the effectiveness of antibody immunotherapy and, specifically, using C2B8 or CD23 antibody therapy remains a high priority in the treatment of human leukemia and lymphoma patients.
- the anti-CD23 antibody exemplified in the methods herein was also developed by IDEC and is a primatized anti-CD23 antibody of the IgGl isotype.
- an object of the invention is to provide novel therapeutic agents, in particular antibody dimers for use in antibody therapies.
- Figure 1 contains DNA and predicted amino acid sequences of a "dimeric anti-CD20 light chain (version 1).
- Figure 2 contains DNA and predicted amino acid sequences of a "dimeric" anti-CD20 heavy chain (version 1).
- Figure 3 is a schematic map of expression construct used to express the subject antibodies.
- Figure 4 contains structures of C2B8 ( CD20) homodimer and C2B8/p5E8 heterodimer ( ⁇ CD20/ ⁇ CD23).
- Figure 5 contains SDS/PAGE results comparing C2B8 (-s-s-) homodimers and C2B8/p5E8 (-s-) heterodimers to starting material.
- Figure 6 contains SDS/PAGE results comparing C2B8 (-s-s- and -s-) homodimers and C2B 8/p5E8 (-s-) heterodimers to starting material.
- Figure 7 contains HPLC analysis of C2B8 homodimers.
- Figure 8 contains HPLC analysis of C2B8/p5E8 heterodimers
- Figure 9 shows binding of C2B8 (-s-s-) homodimer to CD20 psotive cell lines (SKW and SB).
- Figure 10 contains results of a competitive binding assay of C2B8 and C2B8 (-s-s-) homodimer on SKW cells.
- Figure 11 shows binding of ⁇ CD20/ ⁇ CD23 heterodimer (C2B8/p5E8) to SKW and DHL-4 cell lines.
- Figure 12 shows binding of CD20 C2B8 homodimer and ⁇ CD20/ ⁇ CD23/p5E8 heterodimer to SKW cells (CD20+/CD23+).
- Figure 13 shows anti -turn or activity of C2B8 chemical (-s-s-) dimers on
- Figure 14 shows anti-tumor activity of C2B8 (-s-s-) dimers on Daudi tumor xenografts.
- Figure 15 shows apoptotic activity of C2B8 (-s-s-) homodimer.
- Figure 16 shows apoptotic activity of C2B8/p5E8 (s) heteromer.
- Figure 17 shows growth inhibition of B-lymphoma CD20/CD23 positive cell lines (SB and SKW) afer 96 hours continuous exposure to MAb.
- the present invention generally relates to a process for the preparation of biologically active antibody dimers and pharmaceutical composition containing such antibody dimers.
- the present invention further relates to the use of biologically active antibody dimers for the preferential killing or inhibition of selected cell populations in the treatment of diseases such as cancer and autoimmune disorders.
- homodimers were chemically generated from naturally occurring monoclonal antibodies by using chemical cross-linkers to introduce a thioether bond between the two IgG antibodies (Ghetie, PNAS 94:7509-7514 (1997)). Because the dimers are formed using chemically functionalized antibodies, one cannot control where the thioether linkage occurs. As a result, the Ghetie method yielded a low amount of homodimers and resulted in a mixture of naturally occurring, disulfide linked homodimers and the chemically generated thioether linked homodimers.
- the present invention is distinguished from Ghetie by the use of monoclonal antibodies which have had a cysteine residue genetically engineered at a specific site on the F c arm of the antibody, thereby eliminating the need to chemically introduce a reactive thiol group.
- the method of the present invention increases yield of homodimer formation to 40-50% of the starting material, and is applicable for preparing either disulfide or thioether linked antibody homodimers, preferably IgG/IgG homodimers.
- thioether linked homodimer was more efficient than the Ghetie method as determined by SDS-PAGE (reducing) gels. Because of the high yield and efficiency of thioether linked homodimers, this method, unlike the Ghetie method, can also be used for preparing antibody heterodimers (preferably IgG/IgG heterodimers), in which each antibody arm is directed against different antigens.
- antibody heterodimers preferably IgG/IgG heterodimers
- the C2B8 dimers using this present method were capable of initiating apoptosis in proliferating malignant B-cell populations. More importantly, these dimers were strongly growth inhibitory for lymphoma cells in culture, showing a 200-fold increase in potency over dimers prepared according to the method of Ghetie. Homodimers (disulfide linked) were also evaluated in animals and shown to have better therapeutic activity than the parent molecule C2B8.
- the monoclonal antibodies used for the present invention can be any monomeric antibody, and need not be limited to IgG.
- cysteine may be from any mammalian host.
- the location of the cysteine is not limited to this position, and the invention embraces incorporation of cysteine at other sites.
- other sites on the antibody may be better suited for cysteine placement.
- the placement of cysteine at position 444 may not be preferred because the cysteine molecule (one on each arm) is close in proximity to the cysteine on the neighboring heavy chain such that an intrachain disulfide bond may form. Therefore, it may be preferable to place cysteine at a different site, e.g., on the outside loop of a domain where the cysteine molecules would physically be further apart.
- Three specifically contemplated alternative positionings with the anti-CD20 antibody 2B8 could include replacing the serine residue at position 416, the glutamine residue at position 420, or the glycine residue at position 421. These sites have been selected cognizant of the fact that one desires to enhance dimer formation yet retain the antibody affinity and effector functions as much as possible. Also, it is anticipated that other sites may also provide for effective dimer formation.
- Various molecular biological techniques can be employed by one skilled in the art to insert the cysteine at the appropriate site with the resultant antibody molecule.
- site directed mutagenesis was used.
- Production of the recombinant antibody then, in general, includes introduction of a recombinant gene encoding an antibody heavy chain into any suitable host cell together with a recombinant gene encoding an appropriate antibody light chain.
- the transfected cells can either be grown in vitro or in vivo.
- the reaction can be effected at lower temperatures or with other reducing agents, such as mercaptoamines or mercaptoethanol. These reaction conditions may require a higher molar excess, which may be readily determined using routine experimentation by one of skill in the art. Under the limiting conditions used, these agents will reduce the most accessible cysteine first. Thus, it is important that the genetically engineered cysteine molecule be positioned correctly and be readily available for reduction. This will increase the likelihood that the genetically engineered cysteine will be the molecule forming bonds with cysteines or other thiol reactive groups on other antibody molecules. Additionally, the introduced cysteine must be positioned correctly on the heavy chain so as to not interfere with Fc ⁇ R binding or complement activation. This can be determined by trial and error experimentation.
- the methods of the present invention produce either dimers formed by disulfide bonds or dimers formed by thioether linkage.
- disulfide bonds the bonds form naturally between the thiol groups on the cysteine.
- a maleimido crosslinker (which is thiol reactive) is added to the antibodies which forms a bridge between the two antibody molecules.
- maleimido cross-linkers There are a variety commercially available of maleimido cross-linkers which can be used for the present invention. These cross-linkers bind on one side to a thiol group and on the other side to any of a variety of molecules (for example, lysine, a carboxyl group, etc.) which are naturally present on an antibody molecule.
- a dimer can be formed between an antibody which has been modified to contain a cysteine molecule at a specific position and another antibody which has not been modified.
- special conditions i.e. purifying the selectively reduced MAb by applying it to a PD-10 column and equilibrating with deoxygenated normal saline containing sodium citrate (lOmM) and EDTA (ImM)
- LOmM deoxygenated normal saline containing sodium citrate
- ImM EDTA
- the method of the present invention produces very little if any naturally occurring dimers, and thus obtains a high yield of the desired dimer.
- the dimers produced by the present invention also, surprisingly, enhanced apoptotic activity of B cells from chronic lymphocytic leukemia (CLL) patients.
- CLL chronic lymphocytic leukemia
- B cell lymphoma cells expressed enough CD20 to elicit complement activation when antibody dimers were used.
- CLL B cells express low levels of CD20, and previous attempts to activate complement mediated killing of CLL B cells were unsuccessful. Therefore, it was surprising to discover that the dimers produced by the method of the present invention were capable of inducing apoptosis of B cells from CLL patients.
- the anti-CD23 antibodies produced by the subject invention can be used for treatment of conditions including the following:
- the antibody molecules produced by the method of the present invention can be used in pharmaceutical compositions for any application wherein antibodies are therapeutically beneficial, e.g., the treatment of cancer and autoimmune disorders in mammals, especially humans.
- the genetically engineered antibodies of the present invention can be formulated according to known methods to prepare pharmaceutically useful compositions such as by admixture with a pharmaceutically acceptable carrier vehicle. Suitable vehicles and their formulation are described, for example, in Remington's Pharmaceutical Sciences (16 th Ed, Osol, A. Ed, Mack Easton PA (1980)).
- a pharmaceutically acceptable compositions suitable for effective administration such compositions will contain an effective amount of antibody, either alone, or with a suitable amount of carrier vehicle, e.g., a buffered saline solution.
- compositions of the invention will be administered to an individual in therapeutically effective amounts. That is, in an amount sufficient to treat a particular condition, e.g., a cancer or an autoimmune disorder.
- the effective amount will vary according to the weight, sex, age and medical history of the individual. Other factors include the severity of the patient's condition, the mode of administration, and the like.
- the compositions will be administered in dosages ranging from about 0.01 to about 2 picomoles/ml, more generally about 0.0001 to about 200 picomoles/ml.
- compositions may be provided to a patient by any means known in the art including oral, intranasal, subcutaneous, intramuscular, intravenous, intraarterial, parenteral, etc.
- Figure 1 shows the nucleotide and predicted amino acid sequence of the murine anti-human CD20 light chain variable domain fused to the human kappa light chain constant domain.
- Figure 2 shows the nucleotide and predicted amino acid sequence of the murine anti-human CD20 heavy chain variable domain fused to the human gamma 1 heavy chain constant domain.
- This expression construct ( Figure 3) was transfected into IDEC's CHO cell line designated 15C9 which was originally derived from CHO DG-44 (Urlaub et al, Som. Cell Mol. Gen. 12(6):555-566, 1986). Following selection with G418, a high level immunoglobulin producing clone, termed 3F9, was isolated. 3F9 produces and secretes into the cell growth medium, roughly 3.4 pg/cell/day of immunoglobulin. The ELISA assay of immunoglobulin productivity measures L 2 H 2 immunoglobulin molecules irrespective of their monomeric, dimeric or oligomeric configuration. As evidenced by western blot analysis, the majority of the secreted immunoglobulin is monomeric (L 2 H 2 ). However, a small percentage is in the dimeric and larger oligomeric forms.
- the 3F9 cell line was then selected in 5 nM methotrexate. Growth in methotrexate can be used to artificially induce gene amplification (Alt et al, J. Biol. Chem. 253:1357-1370 (1978)) and expression of the plasmid encoded DHFR gene. Concomitantly, the linked immunoglobulin light and heavy chain genes will also be amplified resulting in increased immunoglobulin gene expression and higher immunoglobulin protein production. Through gene amplification, we were able to effectively induce an increase in total anti-CD20 production levels. Following selection, the clone designated 3F9-50B11 was identified. 3F9-50B11 produces roughly 6.3 pg/cell/day of anti-CD20 protein. b. Purification C2B8/SH fVer. I):
- C2B8/SH was purified from growth media (12L at 15 mg/L) using protein A (pA) column Chromatography. Sodium azide (0.01% final concentration) was added to the C2B8/SH antibody containing media and pH adjusted to 7.5 with ION NaOH. The material was applied to a PBS washed pA affinity column (15 ml column, Bioprocess Ltd.) at approximately 3 ml/min. in a 4-8 °C cold room, followed by washing with at least 5 column volumes PBS (100 ml). Antibody was eluted from the pA column with 100 ml Sodium Citrate (0.1 M, pH 3.5), and immediately neutralized to pH 7 with IM Tris Base.
- pA protein A
- C2B8/SH (pA purified) was dialyzed against PBS (1000 ml x 4 changes over 3 days), concentrated to approx. 10 mg/ml under Nitrogen (50 psi) in an Amicon stirred cell concentrator (MWCO 30,000), and filter (0.2 ⁇ m) sterilized.
- C2B8/SH IgG 150 kDa having a genetically engineered thiol group in the antibody heavy chain is able to form a 300 kDa IgG/IgG homodimer through intermolecular disulfide linkage.
- the amount of homodimer formed was determined using analytical HPLC and non-reducing SDS/PAGE.
- Analytical size- exclusion high performance liquid chromatography (SE-HPLC) was performed using a Beckman 126 HPLC system operating isocratically at a flow rate of 1.0 ml/min, with a mobile phase consisting of 100 mM sodium phosphate, 150 mM sodium chloride, pH 6.8.
- Non-Reducing SDS/PAGE gels of CHO secreted C2B8/SH (Figure 5, Lane 1) showed a major protein band at 150kDa (IgG) and HPLC analysis of several preparation showed ⁇ 6% IgG/lgG homodimer (300kDa) in MAb containing growth medium. After pA purification and concentration, three major protein bands were observed ( Figure 5, Lane 2). Molecular weight determination by HPLC showed the three protein peaks at 150 kDa (80.3%), 300 kDa (14.9%) and >450 kDa (4.8%»).
- EXAMPLE 2 (Ntb #: 1966/84): Selective Reduction of C2B8/SH and Preparation of C2B8, Disulfide Linked, Homodimer ( Figure 4.1)
- DTT dithiothreitol
- MAbs partially reduced using DTT for use in preparing affinity columns (Goldenberg et al, Bioconj. Chem. 2:275-280 (1991)) or for immunoconjugate preparations (Siegall et al, Bioconj. Chem.
- This method used DTT to partially reduce either the intra or inter molecular disulfide bond and allow IgG/IgG dimers to reform more efficiently.
- 0.045 mg of Dithiothreitol (DTT Pierce Product #:20290) in calcium and magnesium free PBS, pH 7.4 (cmfPBS,) was added to 21.8 mg of pA purified MAb C2B8/SH in cmfPBS containing 3.5 mM Na 2 -EDTA, to give a final ratio of 2.0 moles DTT per mole of MAb.
- the reaction was immediately degassed and incubated under nitrogen for three hours at 37 °C.
- the MAb was purified from unreacted material using Sephadex G-25 column chromatography (PD-10 columns, Pharmacia Fine Chemicals) that was equilibrated with PBS.
- the MAb containing fraction was collected according to manufacturers instructions in a final volume of 3.0 ml equilibration buffer (PBS).
- PBS 3.0 ml equilibration buffer
- the selectively reduced C2B8/SH was further incubated for two hours at room temperature in air.
- the 300-kDa disulfide (-s-s-) linked homodimer was purified from monomer and higher molecular weight aggregates using preparative HPLC.
- Preparative SE- HPLC was performed using a Beckman 126 HPLC system operating isocratically at a flow rate of 4.0 ml/min. with a mobile phase consisting of 100 mM sodium phosphate, 150 mM sodium chloride, pH 6.8. The separation was performed at room temperature using a 21.5 x 75 mm TosoHaas TSK-Gel SW guard column attached to a 21.5 x 300 mm TosoHaas TSK-Gel G3000-SW column. Fractions were collected manually by monitoring the computer trace of Absorbence at 280 nm in real time. In general, homodimers were >95% pure after HPLC purification.
- Bismaleimidohexane (BMH, Pierce Chemical Co. Product #:22319) was diluted to lOmM in DMF and added to the selectively reduced C2B8/SH to give a final molar ratio of 2.5 moles BMH per mole MAb.
- the mixture was rotated for 2.5 hours at room temperature in a N 2 atmosphere.
- the reaction was terminated by the addition of 0.1 ml Cysteine (lOOmM in PBS) and stored at 4°C (normal atmosphere) until analysis and purification using HPLC.
- the mixture was analyzed using the analytical HPLC method described in example 2.
- the fraction (300 kDa) containing the thioether linked (-s-) C2B8 homodimer represented 28% of the total protein collected ( Figure 7 and Table 1).
- Preparative HPLC (as described in example 2) was used to purify the (-s-) homodimer from the unpurified mixture with purity typically >95%, as determined by SDS-PAGE (non-reducing) gels and analytical HPLC (results not shown).
- Analysis of the purified C2B8 (-s-) homodimer by SDS/PAGE under reducing conditions showed three major protein bands at approximately MW of 22 kDa (L chain), 55 kDa (H-chain) and 110 kDa (H-H dimer) ( Figure 6, Lane 7).
- disulfide linked homodimer or monomer Ab showed the 2 expected protein bands at 22 and 55 kDa.
- MAb p5E8 (4.5x 10 "5 M in PBS) was functionalized by addition of a 6 fold molar excess of SMPB (lOmM in DMF), and rotating the mixture for two hours at room temperature.
- Heterodimer Formation
- Heterodimer (anti-CD20/anti-CD23) was prepared by mixing 1.5 mole equivalents of SMPB containing p5E8 (11.37 mg) with 1 mole equivalent freshly reduced C2B8/SH (8.0 mg) for one hour at room temperature in a N 2 atm. Heterodimer was analyzed and purified using HPLC, as described in example 2. Figure 8 and Table 2 show HPLC chromatograms of unpurified and purified heterodimer compared to starting material. Purity of the 300 kDa heterodimer was >95%, as determined by analytical HPLC (Table 2) and non-reducing and reducing SDS-PAGE gels Figure 6. Reducing SDS/PAGE ( Figure 6, lane 6) also showed three major protein bands after reduction, including a non-reducible 110 kDa band, consistent with the formation of thioether linked H-H dimer.
- Binding of monomer and dimerized antibody to various cells was evaluated by indirect immunostaining using FITC anti-human IgG and analyzed using flow cytometry (indirect IF).
- Cells (2xl0 6 viable cells in 0.1 ml cmfPBS/2% Fetal Calf Serum/0.1 % Sodium Azide, PBS/FCS buffer) were incubated for one hour on ice with 0.1 ml of 5 fold serially diluted antibody.
- Figure 9 compares the binding of MAbs: C2B8 (disulfide linked) homodimer, C2B8, and RF-2 on the CD20+/CD23+ positive cell lines, SKW and
- the binding affinity of the C2B8 homodimer and monomer for the CD20 antigen was compared using a competitive binding assay (Figure 10).
- SKW cells were first incubated for 30 minutes on ice with various amounts of 5-fold serially diluted murine (anti-CD20) MAb 2B8, and by 0.1 ml (at 1 ⁇ g/ml) of either C2B8 monomer or homodimer.
- Indirect IF as described for Figure 9, evaluated the amount of C2B8 binding. Previous experiments had demonstrated no reactivity of the FITC anti-human IgG for the murine 2B 8 antibody .
- MAb treatments were administered i.p. on various schedules indicated for each experiment.
- Antibody was diluted in PBS and administered i.p. as mg per mouse with 8 animals in each group.
- Control groups remained untreated.
- Data is reported as median tumor volume for control or treated animal groups.
- a complete regression was defined as a failure to detect tumor for at least two measurements (> 2 weeks).
- Figure 13 compares anti -tumor activity of low-dose (200 ⁇ g/mouse) C2B8 homodimer (schedule: every 5 days x 3 injections, Q5dx3) to the activity of dose and schedule optimized C2B8 monomer (1 mg/mouse, Q5dx2).
- MAb treatment was initiated on established tumors, 50-150 mm 3 at start of treatment.
- the C2B8 homodimer showed tumor growth inhibition comparable to dose optimized C2B8.
- day 65 50% of the animals treated with 200 ug x3 doses of C2B8 homodimer showed complete tumor regression. Animals receiving 1 mg x 2 doses of C2B8 had 37.5% complete regressions.
- Figure 14 compares the activity at matching schedules (Q5dx3) of 200 ⁇ g/mouse C2B8 monomer or homodimer on established tumors 150-250 mm 3 in size. Tumor growth of the C2B8 homodimer treated mice was inhibited to a greater extent than a comparable amount of the C2B8 monomer. At this dose (0.2 mg/mouse), 62.5% of the homodimer treated mice had completely regressed tumors, while 25% of monomer treated mice showed complete tumor regression.
- Q5dx3 the activity at matching schedules
- the ability of homodimers to induce apoptosis of CD20 + B cell lymphoma cells was determined by TUNEL assay. Disulfide linked homodimer was compared to C2B8 and RF2 on DHL-4 (CD20 + ), Ramos (CD20 + , CD23 + ) and SKW (CD20 + , CD23 + ) cells (lxlO 6 cells/ml) at log-phase of growth.
- the cells were propagated in RPMI 1640 (Irvine Scientific) plus 5% Fetal Bovine Serum (FBS) with 2 mM L-Glutamine (Irvine Scientific) and 100 U/ml of Penicillin- Streptomycin (Irvine Scientific) at 37 °C in 5% C0 2 ) incubator.
- FBS Fetal Bovine Serum
- Irvine Scientific 2 mM L-Glutamine
- Penicillin- Streptomycin Irvine Scientific
- EXAMPLE 9 C2B8 Homodimers mediated complement dependent cytotoxicity of normal B cells
- CDC complement dependent cytotoxic
- Peripheral blood mononuclear cells PBMC were isolated from blood of healthy human donors by Ficoll-Hypaque gradient centrifugation. Viability was determined by Trypan blue dye exclusion and was >98%.
- PBMC's per tube were incubated at room temperature for 45 minutes with either C2B8 (-s-s) homodimer or monomer, and washed with 2 ml of HBSS by centrifugation and aspiration of supernatant to remove unbound antibodies.
- the cell pellet was re-suspended with 100 ⁇ l rabbit complement (ICN/Cappel Cat. #55866) at different dilutions and incubated for 60 minutes at 37°C. After incubation, lO ⁇ l of anti-CD 19-FITC antibody (Pharmingen) was added.
- CD 19 + cells incorporating PI represented the dead or dying cell population and was determined using the WinList Software.
- Data in Table I show that the C2B8 homodimer is effective in mediating CDC of peripheral CD19 + B cells.
- Control cells incubated without complement showed less than 10% cytotoxicity (data not shown).
- a Antibody was tested at the optimum concentration of 2 ⁇ g/ml, as determined from a previous experiment.
- Cytotoxicity was determined as the percentage of CD 19 + cells that showed uptake of propidium iodide stain.
- the ability of homodimers and heterodimers to directly inhibit the growth of B lymphoma cell lines SKW and SB was determined by a proliferation inhibition assay. Briefly, varying concentrations of C2B8, p5E8, C2B8 homodimer and C2B8-p5E8 were added to 5x10 5 in 96-well flat bottom plates in 200 ⁇ l of growth medium (5% FBSRPMI-1640 medium) and incubated for 96 hours at 37°C with 5% C02. During the last 18 hours of incubation, 50 ⁇ l of redox dye alamar blue (Biosource International, Cat. DAL 1100) was added to each well. Following incubation, plates were cooled to room temperature for 10 minutes on a shaker and the intracellular reduction of the dye was determined and fluorescence was read using a 96-well fluorometer with excitation at 530nm and emission at 590nm.
- redox dye alamar blue Biosource International, Cat. DAL 1100
- the results are expressed as relative fluorescence units (RFU).
- the percentage growth inhibition was calculated as: [1 -(Average RFU of Test sample ⁇ Average RFU of no antibody control)] x 100%.
- C2B8 homodimer and the heterodimers showed inhibition of both SKW and SB cell growth in vitro in a dose-dependent manner. Consistent with our previous findings, the C2B8 and p5E8 monomers did not inhibit growth of SKW and SB cells. In contrast, both C2B8 (-s-s-) and C2B8-p5E8 (-s) showed dose dependent inhibition of cell growth.
- IC50 values for homodimer were 0.625 ⁇ g/ml for SKW and for SB cells, while IC 50 values for the heterodimers raised from 0.625 ⁇ g/ml to 1.41 ⁇ g/ml.
- CD20 HSB cells showed no effect, indicating that the observed effect was mediated via the CD20 molecule on the surface of B cell lymphomas.
- cross- linking of C2B8 by direct coating of culture wells without a secondary antibody prior to the addition of cells also resulted in inhibition of cell growth, further confirming above observation (data not shown).
- C2B8 homodimer to induce apoptosis using CD20 + B cells from human patients diagnosed with chronic lymphocytic leukemia (CLL) was also determined by TUNEL assay.
- Disulfide linked homodimer was compared to monomer for apoptosis induction on lymphocytes isolated from a donor diagnosed with CLL.
- the PBMC were cultured in RPMI 1640 medium supplemented with 2% donor plasma, plus 2mM L-Glutamine and 100 U/ml of Penicillin- Streptomycin. As controls, cultures were incubated with C2B8 monomer and the non-binding MAb RF2.
- Example 7 After 120 hours of incubation, cells were harvested and fixed with 70% (v/v) ethanol and analyzed for apoptosis by TUNEL assay, as descried earlier (Example 7).
- the treatment of leukemic cells by C2B8 homodimer resulted in approximately 20% increased cell death by apoptosis, compared to cells that were with the same concentrations of C2B8 monomer or the control antibody, RF2 (Table II).
- RF2 the control antibody
- a Apoptosis was determined by Tunel assay, as described under example 7. Degree of apoptosis was expressed as % apoptosis by sample divided by % apoptosis of controls. Flow cytometric analysis was performed on Becton- Dickinson FACScan using a FACScan Research Software package and the final data analysis was performed using the WinList Software package (Variety Software House). Percentage of cells positive for apoptosis was determined as the percentage of gated cells that were positive above the background, autofluorescence.
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JP2002536969A (ja) | 2002-11-05 |
CA2359994A1 (en) | 2000-08-03 |
EP1970385A2 (en) | 2008-09-17 |
US20050158828A1 (en) | 2005-07-21 |
US6897044B1 (en) | 2005-05-24 |
DK1157042T3 (da) | 2008-12-08 |
DE60039752D1 (de) | 2008-09-18 |
AU775577B2 (en) | 2004-08-05 |
PT1157042E (pt) | 2008-11-18 |
CY1108489T1 (el) | 2014-04-09 |
EP1157042B1 (en) | 2008-08-06 |
EP1157042A1 (en) | 2001-11-28 |
AU3473100A (en) | 2000-08-18 |
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ATE403680T1 (de) | 2008-08-15 |
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